When I discovered the plug on the Ibenez pedal board, I knew it was a good match, but not necessarily the exact item. The fact is the oldest Ibanez pedal board ( the UE700) came out in 1978/1979. As we all know, the movie came out before that. Thanks to the excellent team work of the RPF community, we now know that these were common plugs used on old VTRs (video tape recorders), also video dubbing and editing machines in the 70s for connecting monitors. They were called EIAJ Rec. 8 Pin Male (or female) Connector and later E8M
connectors (actual names vary by manufacturer and distributor listings). The EIAJ 8 Pin connector changed from rectangle to round as time passed so don’t be discouraged if you only see the modern round one when you first start searching. These cables were probably all over place in Hollywood and English studios. Just wanted to put this out there for those seeking the exact piece. Happy Hunting!